﻿
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<!-- saved from url=(0014)about:internet -->
<html xmlns:msxsl="urn:schemas-microsoft-com:xslt" xmlns:mssdk="winsdk" xmlns:script="urn:script" xmlns:build="urn:build" xmlns:MSHelp="http://msdn.microsoft.com/mshelp">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<meta name="Description" content="The !devext extension displays bus-specific device extension information for devices on a variety of buses."/>
<meta name="MSHAttr" content="PreferredSiteName:MSDN"/>
<meta name="MSHAttr" content="PreferredLib:/library/windows/hardware"/>
<title>!devext</title>

<meta name="MS-HAID" content="r26_exts_kernel_A_346bd09f-2f67-4afe-81ad-dc77887036d6.xml"/>


<link rel="STYLESHEET" type="text/css" HREF="../common/backsdk4.css"/>





<style>
html,div { margin: 0; padding: 0;}

body {
	padding: 0px;
	margin: 0px;
	overflow: auto;
	height: 100%;
}

#winchm_template_button{
	float: right;
	width: 93px;
	top: 7px;
	position: relative;
	text-align: right;
	right: 5px;
	height: auto;
}

#winchm_template_top{
	padding: 0px;
	margin: 0px;
	border-bottom: 1px solid #9B9B9B;
	background-color: #B1CEFE;
}

#winchm_template_navigation{
	margin: 0px;
	padding-top: 7px;
	padding-left: 7px;
	padding-bottom: 3px;
	padding-right: 0px;
	font-size: 8.5pt;
	font-family: Arial, Helvetica, sans-serif;
	font-weight: normal;
	color: #585858;
}

#winchm_template_title{
	margin: 0px;
	padding-top: 4px;
	padding-left: 7px;
	padding-bottom: 7px;
	padding-right: 0px;
	font-size: 18px; 
	font-family: Verdana, Geneva, sans-serif;
	color: #363636;
}

#winchm_template_content{
	margin-top: 20px;
	margin-left: 15px;
	margin-bottom: 20px;
	margin-right: 15px;
	width: auto  !important;
	width: 100%;
}

#winchm_template_footer{
	border-width: 1px;
	border-color: #B1CEFE;
	border-top-style: solid;
	margin-top: 15px;
	margin-left: 15px;
	margin-bottom: 20px;
	margin-right: 15px;
	padding-top: 7px;
	padding-left: 0px;
	padding-bottom: 0px;
	padding-right: 0px;
	font-family: arial, helvetica, sans-serif;
	font-size: 8.5pt;
	color: #696969;
	width: auto;
	text-align: left;
}


#winchm_template_container{
	margin: 0px;
	padding: 0px;
	position: static;
	padding-bottom: 3px;
	overflow: auto;
	background-color: #FFFFFF;
}


@media print
{
#winchm_template_container{
	position: static;	
	margin: 0px;
	padding: 5px;
	
	width: auto;
	height: auto;
	overflow: auto;
}
#winchm_template_button{
visibility:hidden;
}
}

#winchm_template_navigation A:link	{text-decoration: none; color:#004080}
#winchm_template_navigation A:visited  {text-decoration: none; color: #004080}
#winchm_template_navigation A:active {text-decoration: none; color: #004080 }
#winchm_template_navigation A:hover {text-decoration: none;color: #0080FF}

A:link	{text-decoration: underline; color:#0033CC}
A:visited  {text-decoration: underline; color: #0033CC}
A:active {text-decoration: underline; color: #0033CC }
A:hover {text-decoration: underline;color: #FF0000;}
</style>
<script type="text/javascript">
function isMobile(){
Agent = window.navigator.userAgent;
if (Agent.indexOf("iPhone")>=1 || Agent.indexOf("iPad")>=1 || Agent.indexOf("iPod")>=1 || Agent.indexOf("Android")>=1){
return true;
}else{
return false;	
}

}
function d_onresize(){
if (window.navigator.userAgent.indexOf("MSIE")>=1){
document.getElementById('winchm_template_container').style.pixelWidth = document.body.offsetWidth - 3;
document.getElementById('winchm_template_container').style.pixelHeight = document.body.offsetHeight - document.getElementById('winchm_template_top').offsetHeight - 4;
}
document.getElementById('winchm_template_container').style.top = document.getElementById('winchm_template_top').offsetHeight + 'px';
}

function d_onbeforeprint(){
document.getElementById('winchm_template_container').style.width = 'auto';
document.getElementById('winchm_template_container').style.height = 'auto';
}

function d_onafterprint(){
d_onresize();
}

if(!isMobile()){

window.onload = d_onresize;
window.onresize = d_onresize;
window.onbeforeprint = d_onbeforeprint;
window.onafterprint = d_onafterprint;

document.write("<style>\n");
document.write("body {overflow: hidden;}\n");
document.write("#winchm_template_container {position: absolute;overflow: auto;top : 0px;right: 0px;bottom: 0px;left: 0px;}\n");
document.write("</style>\n");
}

</script>
</head>
<body><script language="JavaScript" type="text/JavaScript">
function syn(){
if(parent.nav.tree){
 if(parent.nav.tree.loaded){
  parent.nav.tree.selectNode(2319);
 }else{
  setTimeout("syn()",500);
}
  }else{
  setTimeout("syn()",500);
  }}
if(parent!=self){
  setTimeout("syn()",100);
}else{
  parent.location.href = "../../index.htm?page=debugger/_devext.htm";
}
originalOnload = window.onload;
if(originalOnload==null){
window.onload = function(){parent.contentLoaded = true;};
}else{
window.onload = function(){originalOnload();parent.contentLoaded = true;};
}
</script> 


<div id="winchm_template_top">
	<div id="winchm_template_button"><A href="_defwrites.htm" title="Previous topic"><img id="winchm_template_prev" alt="Previous topic" src="../template2/btn_prev_n.gif" border="0"></a><A href="_devhandles.htm" title="Next topic"><img id="winchm_template_next" alt="Next topic" src="../template2/btn_next_n.gif" border="0"></a></div>
	<div id="winchm_template_navigation">Help &gt; 
<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugger_reference.htm">Debugger Reference</A> &gt; <A href="debugger_commands.htm">Debugger Commands</A> &gt; <A href="kernel_mode_extensions.htm">Kernel-Mode Extension Commands</A> &gt; </div>
	<div id="winchm_template_title">!devext</div>
</div>
<div id="winchm_template_container">
	<div id="winchm_template_content"><div id="mainSection"><p>The <b>!devext</b> extension displays bus-specific device extension information for devices on a variety of buses.</p>
<pre class="syntax"><b>!devext </b><i>Address</i><b> </b><i>TypeCode</i></pre>
<h2><a id="ddk__devext_dbg"></a><a id="DDK__DEVEXT_DBG"></a>Parameters</h2>
<p></p>
<dl>
<dt><a id="_______Address______"></a><a id="_______address______"></a><a id="_______ADDRESS______"></a>       <i>Address</i>      </dt>
<dd>
<p>Specifies the hexadecimal address of the device extension to be displayed.</p>
</dd>
<dt><a id="_______TypeCode______"></a><a id="_______typecode______"></a><a id="_______TYPECODE______"></a>       <i>TypeCode</i>      </dt>
<dd>
<p>Specifies the type of object that owns the device extension to be displayed. Type codes are not case-sensitive. Valid type codes are:</p>
<table>
<tr>
<th>TypeCode</th>
<th>Object</th>
</tr>
<tr>
<td>
<p>PCI</p>
</td>
<td>
<p>(Windows 2000 only)  PCI device extension  </p>
</td>
</tr>
<tr>
<td>
<p>ISAPNP</p>
</td>
<td>
<p>ISA PnP device extension</p>
</td>
</tr>
<tr>
<td>
<p>PCMCIA</p>
</td>
<td>
<p>PCMCIA device extension</p>
</td>
</tr>
<tr>
<td>
<p>HID</p>
</td>
<td>
<p>HID device extension</p>
</td>
</tr>
<tr>
<td>
<p>USBD</p>
</td>
<td>
<p>(Windows 2000 only)  USB bus driver extension</p>
</td>
</tr>
<tr>
<td>
<p>UHCD</p>
</td>
<td>
<p>(Windows 2000 only)  UHCD host controller extension</p>
</td>
</tr>
<tr>
<td>
<p>OpenHCI</p>
</td>
<td>
<p>(Windows 2000 only)  Open HCI host controller extension</p>
</td>
</tr>
<tr>
<td>
<p>USBHUB</p>
</td>
<td>
<p>(Windows 2000 only)  USB hub extension</p>
</td>
</tr>
<tr>
<td>
<p>MF</p>
</td>
<td>
<p>(Windows 2000 only)  MF device extension</p>
</td>
</tr>
</table>
<p> </p>
</dd>
</dl>
<h3><a id="DLL"></a><a id="dll"></a>DLL</h3>
<table>
<tr>
<td>
<p><b>Windows 2000
         </b></p>
</td>
<td>
<p>
          Kdextx86.dll
         </p>
</td>
</tr>
<tr>
<td>
<p><b>Windows XP and later</b></p>
</td>
<td>
<p>
          Kdexts.dll
         </p>
</td>
</tr>
</table>
<p> </p>
<h3><a id="Additional_Information"></a><a id="additional_information"></a><a id="ADDITIONAL_INFORMATION"></a>Additional Information</h3>
<p>See <a href="#Bookmark1479">Plug and Play Debugging</a> for applications of this extension command. For more information about device extensions, see the Windows Driver Kit (WDK) documentation.</p>
<h2>Remarks</h2>
<p>The <b>!usbhub</b>, <b>!hidfdo</b>, and <b>!hidpdo</b> extensions are obsolete; their functionality has been integrated into <b>!devext</b>.</p>
<p>For those object types that are no longer supported by <b>!devext</b>, use the <a href="#Bookmark1991"><b>dt (Display Type)</b></a> debugger command.</p>
<p>Here is an example for an ISA PnP device extension:</p>
<pre class="syntax" xml:space="preserve"><code>kd&gt; !devext e0000165fff32190 ISAPNP
ISA PnP FDO @ 0x00000000, DevExt @ 0xe0000165fff32190, Bus # 196639
Flags (0x854e2530)  DF_ACTIVATED, DF_QUERY_STOPPED, 
                    DF_STOPPED, DF_RESTARTED_NOMOVE, 
                    DF_BUS
                    Unknown flags 0x054e2000

NumberCSNs           - -536870912
ReadDataPort         - 0x0000000d (mapped)
AddressPort          - 0x00000000 (not mapped)
CommandPort          - 0x00000000 (not mapped)
DeviceList           - 0xe000000085007b50
CardList             - 0x00000000
PhysicalBusDevice    - 0x00000000
AttachedDevice       - 0x00000000
SystemPowerState     - Unspecified
DevicePowerState     - Unspecified</code></pre>
<p>Here is an example for a PCI device:</p>
<pre class="syntax" xml:space="preserve"><code>kd&gt; !devext e0000000858c31b0 PCI
PDO Extension, Bus 0x0, Device 0, Function 0.
  DevObj 0xe0000000858c3060 PCI Parent Bus FDO DevExt 0xe0000000858c4960
  Device State = PciNotStarted
  Vendor ID 8086 (INTEL)  Device ID 123D
  Class Base/Sub 08/00  (Base System Device/Interrupt Controller)
  Programming Interface: 20, Revision: 01, IntPin: 00, Line Raw/Adj 00/00
  Enables ((cmd &amp; 7) = 106): BM   Capabilities Pointer = &lt;none&gt;
  CurrentState:          System Working,  Device D0
  WakeLevel:             System Unspecified,  Device Unspecified
  Requirements: &lt;none&gt;</code></pre></div></div>	
	<div id="winchm_template_footer">Copyright &copy; 2019. All rights 
reserved. (To change the copyright info, just edit it in template.)</div>
</div>

</body>
</html>
